61642501 has 2 divisors, whose sum is σ = 61642502. Its totient is φ = 61642500.

The previous prime is 61642457. The next prime is 61642541. The reversal of 61642501 is 10524616.

61642501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51408900 + 10233601 = 7170^2 + 3199^2 .

It is a cyclic number.

It is not a de Polignac number, because 61642501 - 2²¹ = 59545349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61642541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30821250 + 30821251.

It is an arithmetic number, because the mean of its divisors is an integer number (30821251).

Almost surely, 2^61642501 is an apocalyptic number.

It is an amenable number.

61642501 is a deficient number, since it is larger than the sum of its proper divisors (1).

61642501 is an equidigital number, since it uses as much as digits as its factorization.

61642501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 61642501 is about 7851.2738456890. The cubic root of 61642501 is about 395.0269724678.

The spelling of 61642501 in words is "sixty-one million, six hundred forty-two thousand, five hundred one".